The real issue is that our roads are far too congested. Blame immigration and JIT manufacture, for its not like the railways are under utilised. Also, our economy is back to pre-recession levels.
50 mph should be the absolute minimum on motorways. Anything less is incredibly dangerous without a safety convoy. Likewise 40 mph on derestricted single carriageways. To maintain momentum and safely get past something going slower is dangerous and hard work in anything articulated or carrying weight.
And lets not forget, for professional drivers, time is money.
As for not undertaking, its a luxury some cannot afford.
Traffic Cops? When was the last time you saw one of them? Getting them to attend accidents is neigh-on impossible.
